Core Java Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Core Java Interview Questions

Questions Answers Views Company eMail

Can we instantiate Interfaces?

Ericsson,

7 15482

What do you mean by the term transient?

Ericsson,

5 11419

What are the two ways you can synchronize a block of code?

Ericsson,

5 14084

Package1 and Package2 both have a method name lets say "methodA" with different implementation. When I import both the packages in a java class how can I use both the methods?

Ericsson,

7 11249

How can you sort dates?

TCS,

2 9309

Why to give the file name same as the public class name in java?

3 7133

Is there any use of an abstract class which has no methods and no attributes?

Wipro,

1 4899

If your team member writes code with lots of static variables and static methods, will it cause any side effects?

KPIT,

3 7498

If I have 1000 objects and my requirement is to sort them quickly, then which collection would you recommend and why?

KPIT,

5 8858

I have a Person object with 5 variables and I want to store them in a file called Person.txt. What should I do?

KPIT,

3 6859

There is a Banking application. It has 2 types of account, Savings and Current. Write a method calculateInterest by passing an ArrayList of these account objects and calculate Interest accordingly. Write code for this situation

ABC, KPIT,

1 3532

If two threads call a static method at the same point of time, what will happen?

KPIT,

3 8838

There are 2 methods in a class. Both have the same method signature except for return types. Is this overloading or overriding or what is it?

KPIT,

9 13723

There are 2 classes, 1 LandAnimal and another WaterAnimal. There is another class Animal which wants to have the properties of both LandAnimal and WaterAnimal. How will you design this situation?

KPIT,

6 10746

I have a String s = java; What is the output when I say s.replaceAll('j', 'k'); Also what is the value of s after replacing?

KPIT,

8 11714

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Un-Answered Questions { Core Java }

what are synchronized methods and synchronized statements? : Java thread

997

What is hashing principle in java?

1026

What is a text string?

1084

What is r * in math?

999

Can you call a method in a method?

1093

Can you extend singleton class?

1105

What are the wrapped, classes?

1057

enlist some features of jdk.

955

What is an array length?

904

Explain java code for recursive solution's base case?

1033

What do you mean by local class?

1006

What does substring mean?

977

what is static import in java? Explain

1016

What is the size of integer?

1094

What are the string methods in java?

1096

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